Relative Error of the Generalized Pareto Approximation. to Value-at-Risk
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1 Relative Error of the Generalized Pareto Approximation Cherry Bud Workshop Discovery through Data Science- to Value-at-Risk Sho Nishiuchi Keio University, Japan Ritei Shibata Keio University, Japan 1
2 Risk Management & Value-at-Risk Basel Accord (BaselⅡ) The risk capital of a bank must be sufficient to cover losses on the bank's trading portfolio. Value-at-Risk Quantitative risk measure (Designated by Basel committee) Extreme Risk 2
3 Generalized Pareto Approximation Distribution function VaR (quantile) Genralized Pareto distribution Excess distribution This approximation is frequently used MacNeil & Frey (2000) Stock return Moscadelli (2004) Operational risk Katz et al. (2002) Hydrology etc 3
4 Generalized Pareto Approximation belongs to the maximum domain of attraction (MDA) with tail index (Pickands (1975), Balkema & de Haan (1974)) is possible when the von Mises condition is satisfied. MDA covers almost all continuous distribution. Fréchet class MDA with tail index. Gumbell class MDA with tail index. (de Haan and Ferreira (2006)) 4
5 Evaluation of the Relative Error Relative approximation error Previous work Beirlant et al. (2003) Asymptotics in terms of a confidence level (threshold: ), pointwise convergence To discuss the uniformity Asymptotics in terms of a threshold Set a upper bound of. 5
6 Main Results Fréchet class with tail index Sufficient conditions In terms of In terms of 6
7 Main Results Gumbel class Weibull-type with index (Sub-class of the Gumbel class) In case of Sufficient conditions In terms of In terms of 7
8 Main Results Gumbel class Weibull-type with index (Sub-class of the Gumbel class) In case of Necessary and Sufficient condition The uniform convergence holds true only in the neighborhood of threshold. 8
9 Numerical Result t distribution (Fréchet class) Threshold: low Degree of freedom large high small Quantile-Quantile plot 9
10 Numerical Result Normal distribution (Gumbel class) Threshold: low high Quantile-Quantile plot 10
11 Conclusion Our result suggests that generalized Pareto approximation does not always provide a good estimation of the VaR. it is safe to restrict our attention into. 11
12 References Balkema, A. A and de Haan, L. (1974) Residual life time at great age, Annals of Probability 2: Beirlant, J., Rault, J.-P. and Worms, R. (2003) On the relative approximation error of the generalized Pareto approximation for a high quantile, Extremes 6: Bingham, N. H., Goldie, C. M., and Teugels, J. L. (1987) Regular variation, Cambridge University Press. de Haan, L. and Ferreira, A. (2006). Extremes value theory: an introduction, Springer. Embrechts, P., Kluppelberg, C., and Mikosh, T. (1997). Modeling extremal events for insurance and finance, Springer. Embrechts, P., McNeil, A. J., and Frey, R. (2005). Quantitative risk management, Princeton series in finance, Princeton University Press. McNeil, A.J. and Frey, R. (2000). Estimation of tail-related risk measures for heteroscedastic financial time series: an extreme value approach, Journal of Empirical Finance 7: Moscadelli, M. (2004) The modelling of operational risk: experiences with the analysis of the data collected by Basel committee, Working paper 517, Bank of Italy. Katz, R. W., Parlange, M. B., and Naveau, P (2002) Statistics of extremes in hydrology, Advances in Water Resources 25:
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